The return of the plugin

> one parameter per line please.

That's not what we've been doing up to now, and that's not what the styleguide says.
> 
```cpp
ReturnType ClassName::FunctionName(Type par_name1, Type par_name2) {
  DoSomething();
  ...
}
```
If you have too much text to fit on one line:
```cpp
ReturnType ClassName::ReallyLongFunctionName(Type par_name1, Type par_name2,
                                             Type par_name3) {
  DoSomething();
  ...
}
```
or if you cannot fit even the first parameter:
```cpp
ReturnType LongClassName::ReallyReallyReallyLongFunctionName(
    Type par_name1,  // 4 space indent
    Type par_name2,
    Type par_name3) {
  DoSomething();  // 2 space indent
  ...
}
```